AT 0906C, 3RD LAR, WHILE CONDUCTING MSR SECURITY, RECEIVED SAF FROM AN UNKNOWN SOURCE IVO THE INTERSECTION OF ASR PHOENIX AND MSR MOBILE 2KM NORTH OF RUTBAH(37S FS188590). THEY ATTEMPTED TO LOCATE SHOOTER(S), AND DETERMINED THE SAF CAME FROM AN ING CHECK POINT AT THE INTERSECTION OF MSR MOBILE AND ASR PHOENIX. THE ING FIRED AT A VEHICLE THAT RAN THEIR CHECK POINT (NFI) AND THE ROUNDS WENT OVER TF WP MSR SECURITY ELEMENT. NO CASUALTIES OR DAMAGE TO EQUIPMENT.